place. nashville public schools have school nurses ready to identify cases and, over in seattle public schools, they have covid-19 site supervisors on deck ready to address an outbreak. but as much as having these plans in place is important, john, health officials also say prevention is important. cdc director dr. rochelle walensky said marsks are now moe important than ever. have a listen. >> everyone who is in the k through 12 school in the fall should be masked. everyone across the country, adults, children, vaccinated or unvaccinated, everyone should be masked. >> and along with masks, john, we're also hearing school officials, some are considering requiring vaccines for staff. a white house covid-19 coordinator, jeff, he said this is a growing trend. >> thank you so much for being with us this morning. >> thank you. the white house under fire after a federal moratorium on